Consider one of the 20 common amino acids at pH 7 and answer the four associated questions: identifying an amino acid and its properties.
a) Alanine - Nonpolar, Hydrophobic, Aliphatic
b) Glutamic acid - Polar, Hydrophilic, Acidic
c) Lysine - Polar, Hydrophobic, Basic
d) Cysteine - Nonpolar, Hydrophilic, Sulfur-containing